spectrogram page. The audio power levels for drawing the audio frequency spectrum are now divided in to three groups. Red/yellow are the loudest signals. The blue group are signals below a ceirtain level. The green group are signals -10dB or more below the average noise level

The first spectrogram shows a radio transmission by the Amateur station DF3LP on 137.678 kHz, received 07:30 UTC on July 25 th 1999. The second audiogram is a transmission by the Amateur station HB9ASB on 137.734 kHz, received 06:45utc on July 25th 1999.

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